Re: [BUG] kernel BUG at mm/vmacache.c:85!

[Oleg Nesterov]

On 04/28, Davidlohr Bueso wrote:
>
> @@ -29,6 +30,7 @@ void use_mm(struct mm_struct *mm)
>                 tsk->active_mm = mm;
>         }
>         tsk->mm = mm;
> +       vmacache_flush(tsk);

But this can't help, we need to do this in unuse_mm(). And we can race
with vmacache_flush_all() which relies on mmap_sem.

But perhaps WARN_ON(tsk->mm) at the start makes sense...

Oleg.

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